if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array("nbt_liens_h.jpg","nbt_activite_h.jpg","nbt_carte_h.jpg","nbt_resa_h.jpg","nbt_rendre_h.jpg",
							"bt_liens_h.jpg","bt_activite_h.jpg","bt_carte_h.jpg","bt_resa_h.jpg","bt_rendre_h.jpg",
							"nbt_liens_a.jpg","nbt_activite_a.jpg","nbt_carte_a.jpg","nbt_resa_a.jpg","nbt_rendre_a.jpg",
							"bt_liens_a.jpg","bt_activite_a.jpg","bt_carte_a.jpg","bt_resa_a.jpg","bt_rendre_a.jpg");

       var nb = image_url.length;
       for(i=0; i<=nb; i++) 
         preload_image_object.src = "fileadmin/templates/image/"+image_url[i];
    }